In September, a light aircraft carrying a number of General Saleh's business associates crashed while, reportedly, on a gold-buying mission in eastern Congo.

ECONOMIST: Uganda and Congo

The US financial watchdog, the Securities and Exchange Commission, has also filed civil fraud charges against a number of Bernard Madoff's business associates and investment advisers who channelled billions of dollars into his funds.

BBC: Madoff victims call for life sentence

No senior Russian officials will talk to him, so he relies mostly on Mr Khodorkovsky's family, friends and business associates.

ECONOMIST: The challenge of capturing a murky country on film